Image display apparatus

ABSTRACT

A display apparatus is provided which includes a display panel, a signal board for processing an image signal used in an image display, and a power source board for supplying power from a power source to the signal board and the display panel. The signal board and the power source board are disposed in a horizontal direction relative to the display panel, and a projection portion, being disposed higher above a surface of the power source board than a circuit element of the power source board and not being connected with a member opposing to a mounting side of the circuit element, is provided on the surface of the power source board where the circuit element is mounted.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. application Ser. No.12/792,131, filed Jun. 2, 2010, which, in turn, is a continuation ofU.S. application Ser. No. 12/164,215, filed Jun. 30, 2008, the contentsof which are incorporated herein by reference.

BACKGROUND OF THE INVENTION

The present invention relates to a large-size image displaying apparatusapplying therein, such as, a liquid crystal display (LCD) or a plasmadisplay (PDL), for example, and it relates, in particular, to supportingstructures of a panel module for building up the large-size imagedisplaying apparatus.

In recent years, accompanying with digitalizing and/or high definitionof the television broadcasting, a demand is made for a large-size andthin-type image displaying apparatus for receiving the televisionbroadcasting on the air, i.e., a television receiver, and as such theimage displaying apparatus for satisfying such demand, as well as, theconventional projection-type displaying apparatus, those also appearwidely on the market, adapting the liquid crystal display (LCD) and theplasma display (PDL) therein. And, including the structures of externalappearance of the apparatus of, such the large-size and thin-type imagedisplaying apparatus, various supporting structures are already known,in the following Patent Documents 1 to 5:

[Patent Document 1] Japanese Patent Laying-Open No. 2007-159048 (2007);

-   -   [Patent Document 2] Japanese Patent Laying-Open No. 2004-151305        (2004);    -   [Patent Document 3] Japanese Patent Laying-Open No. 2004-21104        (2004);    -   [Patent Document 4] Japanese Patent Laying-Open No. 2001-100650        (2001); and    -   [Patent Document 5] Japanese Patent Laying-Open No. Hei        11-109879 (2007).

BRIEF SUMMARY OF THE INVENTION

In general, within the structures of such the image displaying apparatusof large-size and thin-type, in particular, within the image displayingapparatus adapting the liquid crystal display (LCD) therein, as thedisplaying device, for example, there are prepared a panel module,installing a large-size liquid display (LCD), including a reflectionplate and/or a back light device therein, as a unit, and also a housinghaving a predetermined configuration (including a frame and a rearplate), and then within the said housing are installed a power sourceboard or substrate, for supplying a desired electric power to thatapparatus, and also a driver circuit board for driving the displaydevice upon basis of various kinds of input signals (video signals),etc.

By the way, in such the large-size and thin-type image displayingapparatus as was mentioned above, by taking a design property thereof,etc., into the consideration thereof, such a structure is widelyadapted, that the power source board and/or the driver circuit board,etc., mentioned above, are attached on a rear side surface of the panelmodule, as is shown in the above-mentioned Patent Documents 1 to 4, etc.In addition thereto, in recent years, accompanying further large-sizingof the screen size, also the panel module comes to be large in the areathereof.

Such the panel module is, in general, made from a metal plate, such as,aluminum, etc., as a reflection plate of a light, and is constructedwhile disposing a back-light device (e.g., thin fluorescent light lamps)within a frame (e.g., on a bottom portion), which is formed in abox-like shape with thin thickness, a liquid crystal display (LCD) isfixed on a surface thereof. However, accompanying with such large-sizingin the area of the panel module as mentioned above, it is necessary toensure or maintain mechanical strength of the panel module, and forexample, as is disclosed in the Patent Document 5 mentioned above, thereis proposed a structure of providing a supporting member, having such aconfiguration that it extends along with diagonal lines drawn byconnecting four (4) corners on the rear side surface of the flat panel,i.e., an “X”-like shape.

However, such the conventional arts as was mentioned above, inparticular, the structures of providing such the “X”-like shapedsupporting member, as is shown in the Patent Document 5 mentioned above,brings about a problem within thin-sizing of the image displayingapparatus, and therefore, it cannot to be said that, necessarily, it isthe supporting structures suitable for the practical use.

Then, according to the present invention, being accomplished by takingsuch the drawback(s) within the conventional arts mentioned above intothe consideration thereof, and in particular, an object thereof is toprovided an image displaying apparatus and also supporting structuresthereof, being suitable for thin-sizing of the apparatus, as well as,for dissolving the problems accompanying an increase of area of thepanel module due to the large-sizing of the image displaying apparatus,including the structures for attaching the power source board and thedriver circuit board, etc., on the rear surface of the panel module.

For accomplishing such the object as mentioned above, according to thepresent invention, there is provided an image displaying apparatus,comprising: a large-size housing; and a panel module, having a thinplate-like frame having a rectangular shape in an outer configurationthereof, and a display element, which is mounted on said frame, andbeing attached on said housing, wherein on a flange portion, which isformed along with an outer periphery of said thin plate-like framebuilding up said panel module, is further formed a reinforcementportion.

Further, according to the present invention, within the image displayingapparatus as described in above, it is preferable that saidreinforcement portion is made by bending the flange portion on the outerperiphery of said frame into a predetermined cross-sectionconfiguration, through a squeezing process, and in that instance, it isfurther preferable that the flange portion on the outer periphery ofsaid frame is formed into about a “U”-shape, or about a circular orsemi-circular shape, or about a triangle shape, in the cross-sectionconfiguration thereof, through the squeezing process.

Also, according to the present invention, within the image displayingapparatus as described in the above, it is also possible, that saidreinforcement portion is made up with cylindrical members, being fixedalong the outer periphery of said frame, and “L”-shaped members, eachbeing fixed between the cylindrical members neighboring with each other,or a stand portion of said apparatus is attached with, by using saidreinforce portion.

With such the present invention as was mentioned above, while dissolvingthe problems accompanying with an increase of the area of panel moduledue to the large-sizing of the image displaying apparatus, there can beachieved superior effects, i.e., enabling to manufacture a panel module,being superior in the mechanical strength thereof, easily and cheaply,and thereby providing an image displaying apparatus suitable for thelarge-sizing and/or thin-sizing of the apparatus.

Further, according to the present invention, there is also provided theimage displaying apparatus as described in the above, furthercomprising: a plural number of supporting members, each being attachedbetween a pair of the reinforcement portions, which are formed along theouter periphery of said thin plate-like frame, and a circuit boardnecessary for said displaying apparatus, being attached on a reversesurface side of said panel module by using said plural number of thesupporting members.

Also, according to the present invention, within the image displayingapparatus, as is described in the above, said plural number of thesupporting members are disposed in vertical direction, and between ofwhich is attached said circuit board, preferably, and further on thereverse surface side of said panel module may be provided a rear coverfor covering over said panel module that is attached with said circuitboard thereon, and in upper and lower portions of said rear cover areformed opening portions for taking a cooling air into an inside thereof.Or, a stand portion of said apparatus may be made up with using a partof said plural numbers of supporting members.

Further, according to the present invention, within the image displayingapparatus as described in the above, it is preferable that said circuitboard includes a member for defining a predetermined gap between theframe building up said panel module, in a part thereof, and in thatcase, said circuit board mounts thereon a power source circuit forsupplying electric power to said apparatus, and said board is made of aninsulated board. Or, said plural numbers of supporting members may bemade of a conductive material, and in a part of which is formed agrounding portion for electrically grounding the frame building up saidpanel module.

As was mentioned above, with such the present invention as was mentionedabove, while dissolving the problems accompanying with an increase ofthe area of panel module due to the large-sizing of the image displayingapparatus, there can be achieved superior effects, i.e., enabling toprovide the supporting structures of the image displaying apparatus,being suitable for the thin-sizing of the apparatus, including thestructures for attaching the power source board and the driver circuitboard, etc., on the reverse surface of the said panel module.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

Those and other objects, features and advantages of the presentinvention will become more readily apparent from the following detaileddescription when taken in conjunction with the accompanying drawingswherein:

FIG. 1 is a perspective view for showing the entire structures of animage displaying apparatus, according to an embodiment of the presentinvention;

FIG. 2 is a perspective view for showing only a panel module, which istaken out from the image displaying apparatus, seeing it from a rearside surface thereof;

FIGS. 3( a) and 3(b) are views for showing other examples of thestructures for ensuring or maintaining mechanical strength within thepanel module mentioned above;

FIG. 4 is a view of showing the structures, for maintaining themechanical strength within the above-mentioned panel module, inparticular, being suitable for the large-size image displayingapparatus;

FIGS. 5( a) to 5(c) are views for showing the detailed structures of apower source board, which is attached on the reverse surface of thepanel module, within the above-mentioned panel module;

FIGS. 6( a) and 6(b) are views for showing variations of a supportingmember, which is attached on the reverse surface of the panel modulementioned above; and

FIG. 7 is a view for showing the condition of attaching a reverse coverthereon, after attaching a circuit board onto the panel module mentionedabove.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, embodiments according to the present invention will befully explained by referring to the attached drawings. However, thepresent embodiment relates an image displaying apparatus applying aliquid crystal display (LCD) therein, and hereinafter, explanation willbe made on the image displaying apparatus applying this liquid crystaldisplay therein, together with supporting structures thereof.

First of all, FIG. 1 attached herewith shows the entire structures ofthe image displaying apparatus, according to the present invention, inthe expansion manner thereof, and in this figure, a reference numeral100 depicts a liquid crystal display (LCD), as the large-size imagedisplaying apparatus. Further, normally, this liquid crystal display(LCD) is attached on an opening side of a frame 110, being made from athin aluminum plate, for example, which is formed into a box-like shapehaving an about “U”-like cross-section, and being shallow up to thebottom thereof and having a large area, and thereinafter it is called a“panel module”. However, on the bottom surface of this frame 110 aredisposed or aligned, for example, a plural number of fluorescence tubesor a fluorescence body, such as, light-emitting diodes, etc., forobtaining a desired brightness by irradiating a light on the thinplate-like liquid crystal panel (LCD) having a rectangular externalconfiguration from the rear surface thereof (i.e., a backlight).Further, on the rear of this panel module are attached boards orsubstrates, etc., necessary for the apparatus, for example, a signalboard and/or a power source board, etc., the details of which will beexplained later, and on a lower side thereof is attached a stand (i.e.,a leg) for setting up that apparatus.

And, on the surface of the panel module 100 mentioned above is attached,normally, an exterior frame 200, being called “bezel”, which is formedthrough an injection molding of synthetic resin, etc., while on the rearside of that module is also attached a rear cover 300, which is alsoformed through the injection molding of synthetic resin, etc.

Next, FIG. 2 attached herewith shows a perspective view of the panelmodule 100, within the image displaying apparatus mentioned above, inparticular, when only taking it out therefrom and seeing it from therear side thereof. And, according to the embodiment of the presentinvention, as was explained in the above, in particular, for the purposeof dissolving the problem accompanying with an increase of an area ofthe panel module due to the large-sizing of the image display apparatus,i.e., for ensuring or maintaining the mechanical strength of the panelmodule, a part (e.g., an outer side) of a flange portion 111 formedalong an outer periphery of the frame 110, supporting that panel module100 from the rear surface thereof, is further bent through a drawing orsqueezing process so as to have a reinforcement portion 112, forexample, into “U”-like shape in the cross-section thereof, as is shownin a partial cross-section thereof. Thus, with provision of theframe-like reinforcement portion 112, which is formed in the flangeportion 111 the on an outer periphery of this frame 110 through thedrawing or squeezing process, it is possible to maintain the mechanicalstrength thereof, simply or easily, without using an additionalreinforcement member, within that panel module 100 after attaching theliquid crystal display (LCD) onto the frame 110. However, such thestructures for maintaining the mechanical strength of the panel moduleis advantageous for reducing the manufacturing cost, and it isadvantageous, in particular, for the image displaying apparatus havingthe size less than 50 inches. Further, the configuration of bending thepart (e.g., the outer side) of flange portion 111, which is formed alongthe outer periphery of the frame 110 should not be restricted only tothe “U”-like shape mentioned above, and it may be in the configuration,for example, a semi-circular (see FIG. 3( a)) or a triangle (see FIG. 3(b)), in the cross-section thereof.

However, according to the present invention, the reinforcementstructures for maintaining the mechanical strength of the panel module100 should not be restricted only to the structures mentioned above,i.e., the reinforcement portion 112 of the “U”-like cross-section shape,which is formed on the outer periphery of the frame 110 through thedrawing or squeezing process; but other than that, it is enough to beable to maintain the mechanical strength thereof, on the outer peripheryof the frame 110 mentioned above (i.e., a frame-like reinforcementstructure for the frame), and for example, as is shown in FIG. 4, it isalso possible to adapt the following structures; i.e., while preparingmetal pipes 400, in advance, having plural lengths corresponding toouter peripheral sizes of the frame 110 (the vertical and the horizontalsizes), the plural number of those metal pipes 400 are fixed onto theflange portions 111, by means of screws 410, etc., for example, andfurther the metal pipes 400 are fixed by means of a member 420, being“L”-like shaped in the outer configuration thereof, at each of thecorners thereof. Moreover, such structure mentioned above is superior tothe structure mentioned before, as the reinforcement structure formaintaining the mechanical strength of the panel module 100, and isadvantageous, as the reinforcement structures for the image displayingapparatus of size, being equal to 50 inches or greater than that, i.e.,an apparatus having relatively large size.

Following to the above, turning back to FIG. 2 mentioned above, again,with using the reinforcement portion 112 formed on the flange portion111, on the outer periphery of the frame 110, e.g., the reinforcementstructure of the panel module 100 mentioned above, explanation will begiven on the structures for attaching various kinds of circuit boards orsubstrates on the rear surface side thereof, such as, including a signalboard 500 for inputting and conducting predetermined signal processingupon the video signals, as an input signal of that apparatus, andfurther a power source board 510 for supplying various kinds of voltagesupplies necessary for video displaying and/or driving, to be suppliedto each part of the panel module 100 mentioned above.

Thus, as is apparent from FIG. 2 mentioned above, on the rear surfaceside of the panel module 100 mentioned above, surrounding the centralportion thereof are attached plural numbers (in this example, three (3)pieces in total) of supporting members 600, 600 . . . , for example,each being obtained by forming a metal plate into a predeterminedconfiguration (in this example, “U”-like shape in the cross-sectionthereof), with using the reinforcement portion 112, which is formed onthe flange 111, on the outer periphery of the frame 110, directing intothe vertical direction (i.e., crossing a pair of reinforcement portionsopposing to each other, which are formed on the outer periphery of theflange portion). However, in the example shown in this figure, two (2)pieces of the supporting members 600 and 600, on both ends thereof,further extend below, so as to form a stand 120 of the apparatus. And,each of the supporting members 600 is formed with fixing portions 610and 610, at upper and lower positions (2 positions) corresponding to thereinforcement portions 112, which are formed on the flange 111, on theouter periphery of the frame 110, in the longitudinal direction thereof(i.e., the vertical direction in the figure), to be fitted or insertedinto gutters or grooves, which are formed in “U”-like shape in thecross-section thereof, and thereby to be fixed by means of screws 611 orthe like.

With such the supporting members 600 mentioned above, the fixingportions 610 and 610, which are formed at the upper and lower positions(2 positions) thereof, are fixed to the reinforcement portions 112(i.e., the flange portions 111, with which are formed the frame-likereinforcement portions), being the reinforcement structures formaintaining the mechanical strength of the panel module 100, but notattached directly on the rear surface of the frame 110. Thus, the factthat it is not fixed onto the panel module 100 brings about thestructures of bearing no load upon that panel module 100. However, inthe above is shown an example, wherein the two (2) pieces of thesupporting members 600 and 600 at the both ends thereof extend below,thereby to make up the stand 120 of the apparatus, and in such case,also, the load from that stand 120 can be avoided from being applied onthat panel module 100, directly, in particular, then it is advantageous.However, the present invention should not be restricted only to this,and the two (2) pieces of the supporting members 600 and 600 at the bothends thereof may have the same structure of the supporting member 600 atthe center thereof. However, in such case, it would be preferable that,for example, the stand 120 mentioned above is fixed at a central powerof the lower side of the panel module 100, with using the reinforcementportion 112, which is formed on the lower side thereof.

And, the signal board 500 mentioned above, and further the power sourceboard 510, etc., can be attached, within a narrow space remaining on therear surface side of that panel module 100, with utilizing those pluralpieces of the supporting members 600, 600 . . . , with high efficiency.Thus, as is shown the figure, the signal board 500 and the power sourceboard 510 are attached on the supporting members 600, 600 . . . ,respectively, with using holder portions 501 and 511, which are formedin part of that module (in the present example, at corner parts), bymeans of screws 611, etc., in the similar manner to the above, forexample. However, herein, as is shown by broken lines in the figure, itwould be preferable to provide so-called a terminal board or substrate,having a plural number of terminals for connecting that apparatus to anexternal equipment, to be separated from the signal board 500 mentionedabove, as other unit (for example, a lower portion of the signal board500), since it can be attached or removed, easily, dependent uponchanges of the destination of that product, etc.

Also, FIGS. 5( a) to 5(c) attached herewith show the structures suitablefor the signal board 500 and the power source board 510, to be attachedwith using the plural number of the supporting members 600, 600 . . . ,and in particular, the latter thereof, the power source board 510.However, an insulated substrate 512 building up this power source board510 is formed with using an insulating paper or plate havingflexibility, such as, NOMEX film or paper (®) produced by DuPont Corp.,etc., for example, by cutting it out into about a rectangular shape inthe outer configuration (see FIGS. 5( a) and 5(b)). And, as is shown inFIG. 5( a), a plural number of flat head pins 520 and 530, each havingan outer configuration of about “T”-like, are driven (or attached) atpredetermined positions, respectively, from the surface thereof, sothat, as is shown in FIG. 5( b), the flat head pin 520 at the centralportion and those 530 on both sides thereof project the tips thereof onthe reverse side of the insulated substrate 512, penetrating the tipsthereof through the substrate 512, and thereby they are used as spacersfor maintaining a predetermined gap between the reverse surface of theframe 110. However, the projection heights of the flat head pins are sodetermined, the height “hc” of the flat head pin 520 at the centralportion thereof is a little bit larger than the height “hs” (hc>hs) ofthe flat head pins 530 on both sides thereof.

On the insulated substrate 512 of the power source board 510, which isbuilt up in the manner mentioned above, are formed elements (shown bybroken lines in FIG. 5( c)), building up power source circuits forsupplying various kinds of voltage sources, on the reverse surface shownin FIG. 5( b). And, that power source board 510 is disposed in a narrowspace remaining on the reverse surface side of the panel module 100,with using the insulated substrate 512 and the supporting members 600,600 . . . In that instance, as is shown in FIG. 5( c), the insulatedsubstrate 512 (in particular, the elements shown by the broken lines,which are provided on the reverse surface thereof), is disposed at theposition, separating from the reverse surface of the frame 110 of thepanel module 100 by a predetermined distance, in particular, due to thefunction of the flat head pin 520 at the central portion, and further,in that instance, even if the insulated substrate 512 is suppressed andbent by a force applied from an outside, it can be still maintained atthat position separating from the reverse surface of the frame 110 bythe predetermined distance, due to the functions of the flat head pins530 on both sides thereof.

Thus, with the insulated substrate 512 having the flat head pins 520 and530 mentioned above, it is possible to maintain the predetermineddistance necessary, between the elements building up those power sourcecircuits and the frame 110, with certainty (i.e., preventing theelements from contacting on the frame). For that reason, such thestructures can be preferably applied, in particular, as the insulatedsubstrate within the power source board 510, having a possibility ofgenerating an accident due to contacting of the panel module with theframe.

In addition thereto, explanation will be given on variation of thesupporting members 600, 600 . . . , which are provided in the reversesurface side of the panel module 100, in particular, upon the structuresbeing suitable for grounding the frame 110 of the panel module mentionedabove, by referring to FIGS. 6( a) and 6(b) attached herewith. However,this is due to a viewpoint that, it is desirable to keep the groundingpositions in plural numbers thereof, between the panel module and theframe 110, for the purpose of maintaining further preferableperformances, accompanying with an increase of the area of the panelmodule due to large-sizing of the image displaying apparatus.

Thus, as is shown in FIG. 6( a), at desired position(s) on the way ofthe supporting member 600 mentioned above is/are formed hollowportion(s), as shown in FIG. 6( b), in advance, and after attaching thatsupporting member 600 on the reverse surface side of the frame 110 ofthe panel module, a screw 631 made of conductive material, such as, ametal, etc., is also attached thereon, so as to bring about a conductivecondition between that supporting member and the frame, and therebyensuring the grounding condition to be preferable all over the entire ofthe panel module.

Lastly, FIG. 7 shows the state (or condition) where the rear cover 300is attached on the reverse surface of the panel module, after attachingthe circuit boards thereon, such as, the signal board and the powersource board, etc., mentioned above, with using the plural pieces of thesupporting members 600, 600 . . . , which are attached on the reverseside of the panel module, in the manner as was mentioned above. And, thesignal board 500 and the power source board 510 are, as apparent fromthe structures thereof mentioned above, since they are attached whiledefining gaps between the frame 110, on the rear surface side of thepanel module, as is shown by arrows in the figure, the airs flowing intoan inside of the rear cover 300 through openings 301, which are formedin a lower portion thereof, pass through the gaps mentioned above andalso in vicinity of the elements, and thereby moving upwards whilecooling down the signal board 500 and/or the power source board 510.Thereafter, they flow out into an outside from openings 302, 302 . . . ,which are formed in an upper portion of the rear cover 300.

Thus, with such the structures as was mentioned above, there can beresulted the following superior effects; i.e., the circuit boards orsubstrates, such as, the signal board 500 and/or the power source board510, etc., can be disposed within the narrow space remaining on thereverse surface side of the panel module, with using the plural numberof the supporting members, which are attached on the reverse side of thepanel module, and also the cooling of those circuit boards can beensured with certainty. Judging from this, the plural numbers of thesupporting members 600, 600 . . . , which are mentioned above, areattached, aligning, preferably, into a flow of the airs cooling thesignal board 500 and/or the power source board 510, i.e., in thevertical direction.

While we have shown and described several embodiments in accordance withour invention, it should be understood that disclosed embodiments aresusceptible of changes and modifications without departing from thescope of the invention. Therefore, we do not intend to be bound by thedetails shown and described herein but intend to cover all such changesand modifications that fall within the ambit of the appended claims.

1-5. (canceled)
 6. A display apparatus comprising: a display panel; aplurality of support members extending in a vertical direction of thedisplay panel to support the display panel at a back side of the displaypanel; a signal board which processes a video signal used for videodisplay; and a power supply board which supplies power to the signalboard and the display panel, wherein the signal board and the powersupply board are arranged in a horizontal direction of the displaypanel; wherein the power supply board is fixed to the support memberssuch that surface mounting circuit elements of the power supply boardare located opposite to a back of the display panel; and wherein a bossis provided on the surface mounting circuit elements of the power supplyboard, wherein the boss juts out toward the back of the display panelmore than the circuit elements and is not joined to the back of thedisplay panel.
 7. The display apparatus according to claim 6, wherein aplurality of the bosses are arranged in a horizontal direction of thepower supply board and the bosses include a first boss located in acenter of the power supply board and a second boss located at each ofboth sides of the power supply board.
 8. The display apparatus accordingto claim 6, wherein, when the power supply board is not pressed from aback side of the display apparatus, the bosses are not in contact withthe back of the display panel; and wherein, when the power supply boardis pressed from the back side of the display apparatus, the bosses arein contact with the back of the display panel, forming a space betweenthe back of the display panel and the circuit elements which isdetermined depending on a protruding dimension of the bosses.
 9. Adisplay apparatus comprising: a display panel; a plurality of supportmembers being fixed to a frame on a back of the display panel andextending in a vertical direction of the display panel; a signal boardwhich processes a video signal used for video display; a power supplyboard which supplies power to the signal board and the display panel;and a back cover which covers the back of the display apparatus, whereinthe signal board and the power supply board are arranged in a horizontaldirection of the display panel; wherein the power supply board is fixedto the support members and circuit elements of the power supply boardare located on a surface of the power supply board which is opposite tothe frame; wherein a first opening for supplying air to a gap betweenthe power supply board and the frame is provided at a bottom of the backcover and a second opening for allowing the air passed through the gapto flow out is provided at a top of the back cover; wherein a boss isprovided on a surface of the power supply board on which the circuitelements are located, and wherein the boss is not in contact with theframe when the power supply board is not pressed from a back cover sideof the display apparatus and is in contact with the frame when it ispressed, and wherein the boss forms a space between the circuit elementsand the frame even when the power supply board is pressed from the backside of the display apparatus.